Pulse shaping for generating nfc initiator transmit waveform

A technology for transmitting signals and pulse width modulation, which is applied to devices dedicated to transmitters, shaping networks in transmitters/receivers, and transmission modification based on link quality, etc., which can solve problems such as increased power consumption

Inactive Publication Date: 2015-05-27
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Power consumption increases as NFC systems r

Method used

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  • Pulse shaping for generating nfc initiator transmit waveform
  • Pulse shaping for generating nfc initiator transmit waveform
  • Pulse shaping for generating nfc initiator transmit waveform

Examples

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Embodiment Construction

[0042] The detailed description set forth below in connection with the accompanying drawings is intended as a description of example implementations of the present disclosure and is not intended to represent the only implementations in which the present disclosure may be practiced. The term "exemplary" is used throughout this description to mean "serving as an example, instance, or illustration" and should not necessarily be construed as preferred or advantageous over other exemplary implementations. The detailed description includes specific details in order to provide a thorough understanding of exemplary implementations of the present disclosure. In some instances, some devices are shown in block diagram form.

[0043] Although the methodologies may be shown and described as a series of acts for simplicity of illustration, it should be understood and appreciated that the methodologies are not limited by the order of acts since, in accordance with one or more aspects, Some ...

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Abstract

The present systems and methods may shape signals to meet emission mask requirements, current consumption requirements, and overshoot/undershoot requirements relating to the interaction that, for example, occurs when a near field communications (NFC) target comes within range of an NFC initiator, and the initiator generates and transmits an NFC waveform. In some implementations, a pair of bit patterns are defined whose differential output from an amplifier is a shaped pulse width modulated waveform. Varying individual bits of the bit patterns can vary the shaped pulse waveform with predictability. The pulse width modulated waveform may be filtered using a matching network that reduces higher order harmonics, thereby reducing out-of-band emissions.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Application No. 61 / 706,581, filed September 27, 2012, entitled "PULSE SHAPING FOR GENERATING NFC INITIATOR TRANSMIT WAVEFORM," the disclosure of which U.S. Provisional Application is hereby incorporated by reference The contents are fully incorporated into this article. technical field [0003] In general, the present disclosure relates to apparatus and methods for wireless communication and radio frequency identification. More specifically, the present disclosure relates to pulse shaping devices and methods. Background technique [0004] Near Field Communication (NFC) systems operate at 13.56 MHz to enable short-range wireless communication between initiators and targets. An initiator uses the NFC standard protocol (which includes proximity types A, B, and F and the Vicinity protocol) to read RFID tags of targets close to the initiator. [0005] The use of NFC in...

Claims

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Application Information

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IPC IPC(8): H04B5/00H04L25/03H03F3/217
CPCH03F3/217H04B5/00H04L25/03853H04L25/03828H04L1/0033H04B5/0031
Inventor K·阿哈万R·格特克F·萨布里
Owner QUALCOMM INC
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